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I21-Resonant Inelastic X-ray Scattering (RIXS)	Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens Leonardo Martinelli , Krzysztof Wohlfeld , Jonathan Pelliciari , Riccardo Arpaia , Nicholas B. Brookes , Daniele Di Castro , Mirian Garcia-Fernandez , Mingu Kang , Yoshiharu Krockenberger , Kurt Kummer , Daniel E. Mcnally , Eugenio Paris , Thorsten Schmitt , Hideki Yamamoto , Andrew Walters , Ke-Jin Zhou , Lucio Braicovich , Riccardo Comin , Marco Moretti Sala , Thomas P. Devereaux , Maria Daghofer , Giacomo Ghiringhelli Physical Review Letters 132 DOI: 10.1103/PhysRevLett.132.066004 Diamond Proposal Number(s): [20690] Show Abstract ▼ Abstract: We have investigated the 3 d orbital excitations in CaCuO 2 (CCO), Nd 2 CuO 4 (NCO), and La 2 CuO 4 (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as well-localized excitations, similarly to several other cuprates. On the contrary, in CCO and NCO the d x y orbital clearly disperses, pointing to a collective character of this excitation (orbiton) in compounds without apical oxygen. We ascribe the origin of the dispersion as stemming from a substantial next-nearest-neighbor (NNN) orbital superexchange. Such an exchange leads to the liberation of the orbiton from its coupling to magnons, which is associated with the orbiton hopping between nearest neighbor copper sites. Finally, we show that the exceptionally large NNN orbital superexchange can be traced back to the absence of apical oxygens suppressing the charge transfer energy.	Feb 2024

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